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plant viruses

  • Near-Atomic-Resolution Cryo-Electron Microscopy Structures of Cucumber Leaf Spot Virus and Red Clover Necrotic Mosaic Virus: Evolutionary Divergence at the Icosahedral Three-Fold Axes
    Structure and Assembly
    Near-Atomic-Resolution Cryo-Electron Microscopy Structures of Cucumber Leaf Spot Virus and Red Clover Necrotic Mosaic Virus: Evolutionary Divergence at the Icosahedral Three-Fold Axes

    Members of the Tombusviridae family have nearly identical shells, and yet they package genomes that range from 4.6 kb (monopartite) to 5.3 kb (bipartite) in size. To understand how this genome flexibility occurs within a rigidly conserved shell, we determined the high-resolution cryo-electron microscopy (cryo-EM) structures of cucumber leaf spot virus and red clover necrotic mosaic virus. In response to genomic size differences...

    Michael B. Sherman, Richard Guenther, Ron Reade, D’Ann Rochon, Tim Sit, Thomas J. Smith
  • Turnip Mosaic Virus Is a Second Example of a Virus Using Transmission Activation for Plant-to-Plant Propagation by Aphids
    Virus-Cell Interactions | Spotlight
    Turnip Mosaic Virus Is a Second Example of a Virus Using Transmission Activation for Plant-to-Plant Propagation by Aphids

    Transmission activation, i.e., a viral response to the presence of vectors on infected hosts that regulates virus acquisition and thus transmission, is an only recently described phenomenon. It implies that viruses contribute actively to their transmission, something that has been shown before for many other pathogens but not for viruses. However, transmission activation has been described so far for only one virus, and it was unknown...

    Edwige Berthelot, Marie Ducousso, Jean-Luc Macia, Florent Bogaert, Volker Baecker, Gaël Thébaud, Romain Gallet, Michel Yvon, Stéphane Blanc, Mounia Khelifa, Martin Drucker
  • <em>Strawberry Mottle Virus</em> (Family <em>Secoviridae</em>, Order <em>Picornavirales</em>) Encodes a Novel Glutamic Protease To Process the RNA2 Polyprotein at Two Cleavage Sites
    Genome Replication and Regulation of Viral Gene Expression | Spotlight
    Strawberry Mottle Virus (Family Secoviridae, Order Picornavirales) Encodes a Novel Glutamic Protease To Process the RNA2 Polyprotein at Two Cleavage Sites

    Many viruses encode proteases to release mature proteins and intermediate polyproteins from viral polyproteins. Polyprotein processing allows regulation of the accumulation and activity of viral proteins. Many viral proteases also cleave host factors to facilitate virus infection. Thus, viral proteases are key virulence factors. To date, viruses with a positive-strand RNA genome are only known to encode cysteine or serine proteases,...

    Krin S. Mann, Joan Chisholm, Hélène Sanfaçon
  • Open Access
    Encapsidation of Viral RNA in <em>Picornavirales</em>: Studies on Cowpea Mosaic Virus Demonstrate Dependence on Viral Replication
    Structure and Assembly
    Encapsidation of Viral RNA in Picornavirales: Studies on Cowpea Mosaic Virus Demonstrate Dependence on Viral Replication

    The mechanism whereby members of the order Picornavirales specifically package their genomic RNAs is poorly understood. Research with monopartite members of the order, such as poliovirus, indicated that packaging is linked to replication, although the presence of “packaging signals” along the length of the viral RNA has also been suggested. Thanks to the bipartite nature of the CPMV genome, which allows the manipulation of RNA-...

    Inga Kruse, Hadrien Peyret, Pooja Saxena, George P. Lomonossoff
  • Structure and Assembly
    Asymmetric Trimeric Ring Structure of the Nucleocapsid Protein of Tospovirus
    Keisuke Komoda, Masanori Narita, Keitaro Yamashita, Isao Tanaka, Min Yao
  • Pathogenesis and Immunity
    rgs-CaM Detects and Counteracts Viral RNA Silencing Suppressors in Plant Immune Priming
    Eun Jin Jeon, Kazuki Tadamura, Taiki Murakami, Jun-ichi Inaba, Bo Min Kim, Masako Sato, Go Atsumi, Kazuyuki Kuchitsu, Chikara Masuta, Kenji S. Nakahara
  • Genetic Diversity and Evolution
    Diversity, Distribution, and Evolution of Tomato Viruses in China Uncovered by Small RNA Sequencing
    Chenxi Xu, Xuepeng Sun, Angela Taylor, Chen Jiao, Yimin Xu, Xiaofeng Cai, Xiaoli Wang, Chenhui Ge, Guanghui Pan, Quanxi Wang, Zhangjun Fei, Quanhua Wang
  • Virus-Cell Interactions
    Sequential Recruitment of the Endoplasmic Reticulum and Chloroplasts for Plant Potyvirus Replication
    Taiyun Wei, Tyng-Shyan Huang, Jamie McNeil, Jean-François Laliberté, Jian Hong, Richard S. Nelson, Aiming Wang
  • Structure and Assembly | Spotlight
    Structure of Flexible Filamentous Plant Viruses
    Amy Kendall, Michele McDonald, Wen Bian, Timothy Bowles, Sarah C. Baumgarten, Jian Shi, Phoebe L. Stewart, Esther Bullitt, David Gore, Thomas C. Irving, Wendy M. Havens, Said A. Ghabrial, Joseph S. Wall, Gerald Stubbs
  • Virus-Cell Interactions
    Triple Gene Block Protein Interactions Involved in Movement of Barley Stripe Mosaic Virus
    Hyoun-Sub Lim, Jennifer N. Bragg, Uma Ganesan, Diane M. Lawrence, Jialin Yu, Masimachi Isogai, John Hammond, Andrew O. Jackson

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